• Home
  • Rajshree B Jotania
Rajshree B Jotania

Rajshree B Jotania
Gujarat University Ahmedabad India · Department of Physics, Electronics and Space science

M.Sc. (PHYSICS), Ph.D.
Looking for collabarators

About

205
Publications
50,857
Reads
How we measure 'reads'
A 'read' is counted each time someone views a publication summary (such as the title, abstract, and list of authors), clicks on a figure, or views or downloads the full-text. Learn more
1,557
Citations
Introduction
I have joined Department of Physics, Elctronics and Space science, Gujarat University Ahmedabad, India on November 1997. My research interest is nanomagnetic materials: synthesis, cherecterization and applications. Recently I have started working on diffternt types of hexagonal ferrites, hard-soft ferrite composites, ferrite -polymer composites, Microwave absorbing properties of ferrites, green synthesis
Additional affiliations
April 2009 - present
Gujarat University
Position
  • Professor (Full)
April 2009 - present
Gujarat University
Position
  • Professor (Full)
November 1997 - April 2009
Gujarat University
Position
  • Professor (Associate)
Education
June 1985 - August 1992
Saurashtra University
Field of study
  • Physics, Magnetic oxides
June 1982 - April 1985
H & H B Kotak Institute of Science,
Field of study
  • Physics

Publications

Publications (205)
Article
Full-text available
W-type BaZn2Fe16O27 hexaferrite powder was synthesized using a co-precipitation technique. The synthesized precursors were calcined at 950 degrees C for 4 h in static air atmosphere in order to prepare barium-zinc hexaferrite powder. The effect of swift heavy ion irradiation on modifications in the structural and morphological properties of BaZn2Fe...
Conference Paper
ABSTRACT Magnetic materials are important electronic materials that have a wide range of industrial and commercial applications including memory storage devices. Barium hexaferrite, non-corrosive material is of great importance as permanent magnets, particularly for magnetic recording as well as in microwave devices. In the present study, a series...
Conference Paper
Abstract: The Aluminium-substituted M-type barium hexaferrite, BaAlxFe12-xO19, with x = 0.4,0.8,…..2.0 have been successfully prepared by auto-combustion process using citric acid as a fuel and nitrates as oxidants. In order to improve the fundamental magnetic properties of hexaferrite, many studies have also been concerned with cationic substitut...
Article
Full-text available
Abstract- M type Barium hexagonal ferrite (BaFe12O19) has been synthesized by Sol-gel auto combustion route. The effect of sintering temperature on structural and magnetic properties is investigated in detail. The prepared precursors calcined at temperatures in the range of 250 oC – 950 oC and characterized by FTIR, XRD and VSM. Result revealed tha...
Article
Full-text available
A systematic study of the Co1.4Ge0.4Fe1.2O4 system by X-ray, magnetization, and AC-susceptibility techniques is presented. The present system exhibits para-ferri-cluster spin glass transition for x -0.2, while x ⩾0.3 it exhibits only a cluster spin glass transition. The AC susceptibility and DC magnetization data support the cluster spin glass...
Article
Link to download the full paper: https://authors.elsevier.com/c/1ezw83HXllFTU1(free for 50 days) This work investigated the microwave absorbing characteristics of Co-Y doped BaSr Hexaferrites prepared by the ceramic method. X-ray analysis confirmed M-phase at low doping level compositions x = 0.0, 0.2 and traces of spinel phase for x > 0.2, and mic...
Chapter
Full-text available
Nanotechnology has opened the new possibility to transform the agriculture, health sector, industry, and environment at sustainable and cost-effective level widely. Nano-derived products armour with the credential features but still in newborn stages and very sluggish in societal uses. The manufacturing process, regulatory challenges, awareness are...
Conference Paper
This work demonstrates the photovoltaic study of dye sensitised solar cells fabricated using the fluoride doped tin oxide and aluminium doped zinc oxide glass substrate as charge collectors for photoanode and counter electrodes respectively. Cocktail dye of betalain extracted from beetroot (Beta vulgaris) and chlorophyll extracted from spinach (Spi...
Article
The crystal structure, surface morphology, magnetic and thermal properties of the BaFe11.9In0.1O19 substituted M‐type hexaferrite have been investigated. This solid solution was fabricated using ‘two‐steps’ topotactic reactions. It has been determined through the X‐ray diffraction method that, the crystal structure of this solid solution under norm...
Article
Download for free for 50 days at: https://authors.elsevier.com/c/1eh8Mvn2L-k8U Ba2Zn2Fe28O46 hexaferrite was prepared using green synthesis with different quantities of ginger root extract (obtained from 0.0, 17.5, 35, 52.5 and 70 g of ginger root) as a natural antioxidant reducing agent. The dried precipitates were preheated at 550 °C/4 h and fina...
Article
M-type calcium hexaferrite- CaFe12O19 has been prepared in presence of Azadirachta indica, and Murraya koenigiileaves extracts followed by calcination at 650 °C. It was observed that the presence of phytochemicals in both leaves extract plays a vital role in deciding the structural, optical, microstructural, magnetic, and dielectric properties. Pre...
Article
Free access for 50 days: https://authors.elsevier.com/c/1eKsV3IWkc33-2 SrFe12O19 and NiFe2O4 nano ferrite powders were synthesized in the presence of Calotropis Gigantea (crown) flowers extract separately. SrFe12O19/NiFe2O4 nanocomposites were prepared in the presence of crown flowers extract and the effect of different weight ratios (M:S – 9:1, 8...
Book
Nanomaterials are highly promising for potential large-scale employment in a wide range of technological, medicinal, and pharmaceutical applications. While different approaches have been employed for nanomaterials synthesis, green protocols have received significant attention as they address the clean and sustainable environmental aspects, and offe...
Article
The BaFe12-xTixO19 hexaferrites up to x = 3.00 were extended. XRD patterns were Rietveld fitted for P63/mmc (no. 194) space group and the unit cell parameters were defined. The a parameter and V volume of unit cell change non-monotonically with × while the c parameter has linear behavior. The Ti⁴⁺ cations substitute the Fe³⁺ cations in the 2a, 4fVI...
Poster
Effect of Al3+ substitution on Structural and Magnetic properties of U-type hexaferrites, synthesized using citrate gel auto-combustion method
Article
Full-text available
In this study, M-type Barium Strontium hexagonal ferrite was prepared with Co-Sn doping. The crystallographic structure of ferrite compositions was explored using X-ray diffraction (XRD). The microwave absorption characteristics were investigated on a vector network analyzer as a function of the doping of Co2+ and Sn4+, frequency, and thickness of...
Preprint
M-type, Ba0.4Pb0.6Fe12-xCoxO19 (x = 0.00, 0.10, 0.20, 0.30, 0.40) hexaferrites, synthesized using citrate gel auto combustion method, and heated at 950 °C, 4 h for lossless applications. XRD analysis shows the development of the M-phase, along with PbM and hematite. The microstructural analysis reveals the stacking clusters of hexagonally shaped pl...
Article
BaFe12-xTixO19 barium hexaferrites up to x = 2.00 were synthesized by the usual ceramic technology. Crystal structure refinement was realized by Rietveld method of powder XRD at room temperature. The unit cell parameters change non-monotonically with titanium concentration. The minimum volume of ∼ 698.75 ų was determined for the x = 1.00. The mech...
Article
Znx-1NixFe2O4 samples have been synthesized by solid-state reactions. Data on the chemical composition and the surface morphology of the samples have been obtained using a scanning electron microscope. X-ray powder diffractometer has been used to establish the phase purity and to determine the unit cell parameters. It has been found that the obtain...
Article
M-type, Ba0.4Pb0.6Fe12-xCoxO19 (x = 0.00, 0.10, 0.20, 0.30, 0.40) hexaferrites, synthesized using citrate gel auto combustion method, and heated at 950 °C, 4 h for lossless applications. XRD analysis shows the development of the M-phase, along with PbM and hematite. The microstructural analysis reveals the stacking clusters of hexagonally shaped pl...
Article
Full-text available
In this paper, we studied the effect of Ti doping on the structural, magnetic and magnetocaloric properties of the compound La0.67Ba0.22Sr0.11Mn0.95Ti0.05O3 synthesized by the solid–solid method. The structural properties were examined by a Siemens D5000 diffractometer, and the magnetic properties were determined using a SQUID magnetometer. The dev...
Article
A number of solid solutions based on BaFe12-xTixO19 M-type barium hexaferrite doped with titanium cations up to x = 2.00 were obtained using conventional ceramic technology. The phase composition, crystal structure and unit cell parameters were refined by the Rietveld method using powder X-ray diffraction data up to T = 900 K. It was found that all...
Article
In this paper, we investigate the structural, magnetic, and magnetocaloric properties of polycrystalline Pr0.6Sr0.4Mn0.95Fe0.05O3 perovskite manganites. This compound was synthesized utilizing the sol-sol method. X-Ray diffraction (XRD) examination utilizing Rietveld refinement shows that Pr0.6 Sr0.4Mn0.95Fe0.05O3 compound crystallizes in the ortho...
Conference Paper
A series of M-type lanthanum substituted strontium cobalt hexaferrites, Sr 0.5 Co 0.5 La x Fe 12-x O 19 (x = 0.0, 0.05, 0.15 and 0.2) was synthesized using the simple heat treatment method. The synthesized hexagonal ferrites were calcinated at 950°C and 1050°C for 3 hrs in a muffle furnace and then slowly cooled to room temperature. X-ray diffracti...
Article
50 days' free access to this article- https://authors.elsevier.com/a/1c3sJ%7E2-F173U Gallium substituted Z-type Sr3GaxCo2-xFe24O41 (x = 0.0–2.0 in steps of 0.4) hexaferrites were synthesised by the sol-gel auto-combustion process, and sintered at 1150 °C. The structural, morphology, magnetic, Mössbauer, dielectric and microwave absorption propert...
Article
Full-text available
Increase in the spontaneous magnetization up to x < 0.5 is a sequence of appearance of the additional magnetic moment of 2 μ B of the Ni ²⁺ cations in tetrahedral positions. For x > 0.5, the moment decreases in octahedral positions and the spontaneous magnetization also decreases.
Article
Various quantities of ginger (Zingiber officinale) root extract were used to prepare X-type BariumeZinc hexaferrite with the chemical composition Ba2Zn2Fe28O46. The powders were prepared using a combustion treatment method, being pre-heated at 550 deg C for 4 h with the ginger as a fuel, followed by final heating to 900 deg C for 5 h and natural co...
Article
Full-text available
Co4+-Ca2+ substituted M-type barium strontium hexagonal ferrites with chemical composition Ba0.25Sr0.75CoxCaxFe12-2xO19 (x = 0.0, 0.2, 0.4, 0.8, 1.2, 1.6 and 2.0) were prepared by sol-gel auto combustion technique and sintered at 1150 °C for 5 h. The structural, magnetic, electrical and impedance properties of prepared samples were characterized us...
Article
Full-text available
MgFe2O4 ferrite was synthesized in the presence of Solanum Lycopersicum fruit extract using sol–gel auto-combustion technique and heated from 650 °C to 1050 °C with the difference of 100 °C. The effect of heating temperature on phase purity, crystal structure, and magnetic as well as dielectric properties was systematically investigated. XRD analys...
Technical Report
Full-text available
Magnetic oxides and composites II
Article
Development of doped Ba-Sr hexagonal ferrites for microwave absorber applications: Structural characterization, tunable thickness, absorption peaks and electromagnetic parameters, Journal of Alloys and Compounds (2020), doi: https://doi. Abstract In this work, we report microwave absorption characteristics of Ba 0.5 Sr 0.5 (CoCr) x Fe (12-2x) O 19...
Article
In this work, we report microwave absorption characteristics of Ba0$5Sr0$5(CoCr)xFe(12-2x)O19 hexaferrite prepared by a two route ceramic technique. The effect of Co2+-Cr3+content on structural, complex permittivity/permeability and reflection loss properties in Ba0.5Sr0.5Fe12O19 ferrite has been studied. X ray diffraction confirmed the magnetoplum...
Article
Full-text available
In the present study, Cu-substituted M-type lead hexaferrites with chemical composition PbCu x Fe 12Àx O 19 (x = 0.0, 0.2, 0.4, 0.6, 0.8, and 1.0) have been synthesized using a co-precipitation method. As-obtained precursors were preheated at 550°C for 4 h in a muffle furnace, followed by final heating at 1150°C for 5 h. All heated samples were cha...
Book
Full-text available
This book focuses on the synthesis, characterization, and applications of various perovskites, garnets, manganites, carbon-based metal oxide nanocomposites, nanoferrites, and graphene-metal oxide nanocomposites.
Book
Full-text available
For environmental concerns, it is highly desirable to replace gas-based refrigeration by magnetic refrigeration. Magnetic refrigeration has significant advantages such as small volume, chemical stability, low cost, non-toxicity and not causing sound pollution. Among the pertinent magnetocaloric materials, perovskite manganites are of special intere...
Article
Full-text available
In this scientific paper, structural, magnetic, magnetocaloric and critical exponent’s properties of La0.7Sr0.3Mn0.95Fe0.05O3 compound are briefly reviewed. The sample was synthesized by solid state reaction. X-ray powder diffraction analysis at room temperature showed that our sample is single phase without detection of any impurities. The refinem...
Article
Manganese–copper ferrite (MCFO) and dysprosium (Dy)-doped manganese–copper ferrite nanocomposites (Mn0.5Cu0.5DyxFe2−xO4) (x = 0, 0.05, 0.10, and 0.15) were synthesized by sonochemical method. Crystal structure and the structural parameters of the MCFO were analyzed based on the doping concentration of Dy ion. It was observed that the average crysta...
Article
Full-text available
Nanostructured NiFe film was obtained on silicon with a thin gold sublayer via pulsed electrodeposition and annealed at a temperature from 100 to 400 °C in order to study the effect of heat treatment on the surface microstructure and mechanical properties. High-resolution atomic force microscopy made it possible to trace stepwise evolving microstru...
Article
The Dy-substituted Co1/2Ni1/2(Fe2-xDyx)O4 (0.00 ≤ x ≤ 0.08) spinels were obtained in nanosized form. Correlation between chemical composition, crystal structure, magnetic properties and electrodynamics properties was investigated. The features of the fine crystal structure were investigated using neutron powder diffraction. Magnetic properties were...
Article
DOWNLOAD FREE FOR 1 MONTH AT: https://authors.elsevier.com/a/1aMQs3IWkbyahS Gallium substituted Z-type hexagonal ferrites with chemical composition Sr3Co2-xGaxFe24O41 (x = 0.0,0.4, 0.8, 1.2, 1.6, and 2.0) were successfully synthesised in air at 1200 °C for 5 h using the sol-gel auto-combustion technique, in order to investigate the effect of galliu...
Conference Paper
In the present work, we report the structural and microstructural properties of hematite (α-Fe2O3) synthesized using the co-precipitation method. Oleic acid was used as a surfactant in the synthesis process to reduce the agglomeration. Prepared hematite samples were characterized using FTIR, XRD, SEM, DLS and UV-VIS spectroscopic measurements. FTIR...
Article
Full-text available
A pure ferrite and epoxy samples as well as the epoxy/ferrite composites with different 20 wt.%, 30 wt.%, 40 wt.%, and 50 wt.% weight ferrite contents have been prepared by the chemical co-precipitation method. AC-conductivity and dielectric properties such as the dielectric constant and dielectric loss of the prepared samples have been studied. Th...
Article
Polyaniline was blended to tune the magnetic properties of Ba2Ni2Fe12O22 hexaferrites. Polyaniline-blended Ba2Ni2Fe12O22 hexaferrite (weight ratios 1:1, 1:2 and 2:1) composites were prepared by the in situ polymerization method. The obtained polymer-blended ferrite composites were characterized by Fourier transform infrared spectroscopy, x-ray diff...
Article
Keywords: Er-substituted X-type hexaferrite Simple heat treatment method Structural Magnetic and dielectric measurements A B S T R A C T A series of Erbium substituted X-type Ba 2 Co 2 Er x Fe 28-x O 46 (x = 0.00, 0.04, 0.08, 0.12, 0.16, and 0.20) hex-aferrites were prepared by the method of heat treatment. The obtained precursors were heated at 13...
Presentation
The basic concept of Research Methodology was discussed
Presentation
Full-text available
The talk was on hexagonal ferrites synthesis and applications
Poster
Structural, Hysteresis and Electrical Parameters studies of lightly Erbium substituted X-type Ba2Co2ErxFe28-xO46 Hexaferrites discussed
Chapter
Full-text available
In the current scenario of technological devices, industrial, domestic and military applications involve high speed electronic devices operating in GHz region. The microwave absorbers are the key materials incorporated to mitigate electromagnetic interference emanated from high speed electronic devices. In the present chapter, we have discussed mic...
Article
Microwave absorbers are an important topic of interest to mitigate electromagnetic interference. Here, we have investigated electromagnetic absorption properties of Ba0.5Sr0.5CoxInxFe12−2xO19 hexaferrite prepared by the conventional ceramic method. M-type hexagonal structure in the compositions was confirmed from x-ray diffraction analysis. The rol...
Article
Full-text available
In this work, M-type hexagonal ferrite Ba0.5Sr0.5CoxZrxFe(12−2x)O19 and Polyaniline composites have been prepared. The microwave filter characteristics were investigated from 8.2 to 12.4 GHz by measuring scattering parameter in the sample fitted waveguide. The dielectric loss tangent was dominating over magnetic loss tangent in all compositions. Th...
Article
In wireless communication, filters are incorporated to allow/stop the desired range of frequencies depending upon the application. The composites of M-type hexagonal ferrite Ba0.5Sr0.5CoxTixFe12-2xO19 and Polyaniline (PANI) have been prepared with the volume fraction of 30:70 percent. Composite samples were fitted at one end of the rectangular wave...
Article
M-type Ba0.5Sr0.5CoxLaxFe12-2xO19 hexagonal ferrite has been synthesized by the conventional ceramic method. X-ray diffraction analysis confirmed M-type hexagonal structure while scanning electron microscopy revealed a reduction in grain size with the doping of Co2+ and La3+ ions. The electromagnetic/microwave absorption has been measured from 8.2...
Article
M-type Ba0.5Sr0.5CoxLaxFe12-2xO19 hexagonal ferrite has been synthesized by the conventional ceramic method. X-ray diffraction analysis confirmed formation of M-type hexagonal structure while scanning electron microscopy analysis revealed a reduction in grain size with the doping of Co2+ and La3+ ions. The electromagnetic/microwave absorption has b...
Presentation
Full-text available
The recent development in Hexagonal ferrites and their composites were covered
Research
Cobalt substituted Ba-Pb hexaferrites (M-type) were synthesized using the sol-gel auto combustion technique
Poster
Full-text available
Magnesium Ferrites were synthesized In Presence of Solanum Lycopersicum Extract
Presentation
M-type hexaferrites with the chemical composition Ba0.4Pb0.6Fe12-xCoxO19 (x=0.0, 0.1, 0.2, 0.3 and 0.4) were synthesized using sol-gel auto combustion method.